1. Structure of Sarcomere
REVIEW!!!!

2. Review Muscle Fiber/ Cell Structure & FunctionA B A F
Thin/ Light G
Thick band C D C E

3. A band is dark, both myosin and actin
I band is light, only actin, Z lines found here

4. Muscle Origins, Insertions & Actions
Facial Expression and Mastication

5. Muscle Naming Practice
Origin/Insertion definitions
University of Michigan muscle tables
Healthline body maps
Terms of Movement
Gray’s Anatomy online
Muscle Naming Practice

6. Head & Neck Muscles

7. Muscles of Mastication
ORIGIN
INSERTION
ACTION
Temporalis
Temporal fossa
Coronoid process of mandible
Elevate mandible
Masseter
Zygomatic arch
Coronoid process & ramus of mandible
Lateral Pterygoid
Sphenoid & pterygoid plate
Mandible, TMJ
Depress chin,
Side-to-side motion of jaw
Medial Pterygoid
Pterygoid plate & tuberosity of maxilla
Mandible
Grinding motion
TMJ:

8. TMJ: temporomandibular joint
Trismus: “lockjaw” spasm of muscles of mastication
Temporomandibular Joint Dysfunction (TMD) : sometimes called “TMJ” erroneously
Can be a symptom for a variety of disorders or occur for a variety of reasons

9. Major Muscles of Mastication
Masseter
Temporalis
Both elevate mandible

10. Major Muscles of Mastication
Lateral Pterygoid
Medial Pterygoid

11. Muscles of SMiling ORIGIN INSERTION ACTION Risorius
Deep fascia of face
Skin at angle of mouth
Pull lips back laterally
Zygomaticus minor
Zygomatic bone
Skin/muscle of upper lip
Pull angle of mouth up and outward
Zygomaticus major
Skin of Angle of mouth
Pull angle of mouth up and lateral
TMJ:

12. Muscles of frowning ORIGIN INSERTION ACTION Depressor Anguli Oris
Border of mandible
Skin at angle of mouth
Frowny
Depress angle of lip
Platysma
Deltoid & Pectoral
Skin of cheek, mandible
Tense neck, depress mandible

13. Other Muscles of Expression
ORIGIN
INSERTION
ACTION
Frontalis
(occipitofrontalis)
Epicranial aponeurosis / occipital bone
Skin of forehead
Elevate eyebrows, wrinkle forehead
Orbicularis Oculi
Orbital margin, lacrimal bone
Skin around orbit
Closes eyes
Orbicularis Oris
Median part of Maxilla, mandible, nasal septum
Membrane/muscles of lips
“Kissing”
Buccinator
Mandible
Angle of mouth
Suck in cheeks, aids in chewing
Aponeurosis: page 172

14. Which muscle is NOT involved in mastication?
Masseter
Temporalis
Lateral Pterygoid
Orbicularis Oculi
Medial Pterygoid
D. Orbicularis Oculi

15. Tom, a trumpet player, asks you which muscles he should develop in order to be a better trumpeter. What would you tell him?
Masseter and Buccinator
Temporalis and Risorius
Pterygoids and Zygomaticus
Buccinator and Orbicularis Oris
Frontalis and Temporalis
D. Buccinator(pull in cheek) and Orbicularis Oris (purse lips)

16. Which muscle aids in frowning?
Risorius
Platysma
Occipito-Frontalis
Buccinator
Zygomaticus
B. Platysma
True or False? 

17. FALSE.
Why we can’t NOT smile

18. Match the name of the muscle to the description
Note: some of these are not muscles we learned. This is a practice question from past years. You should be able to get most of these answers from what we did in class.
Squints the eye
Furrows head horizontally, pulls scalp posteriorly
Smiling muscle
Puckers the lips
Draws corners of lips laterally & downward
Pulls scalp posteriorly
Tensed during shaving of chin and neck
Corrugator supercilii
Depressor anguli oris
Frontalis
Occipitalis
Orbicularis Oculi
Orbicularis Oris
Platysma
Zygomaticus E C H F B D G